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I know this may seem trivial but when you do your port/polish do you use flow bench tester?
Also, I am conjuring up what I am going to do on my build this winter. I have a 650sx and would like to get a more linear power out of her with the good portion on the bottom end. I would like your suggestions on a few things as I am considering sending my project your way for the machine work. (I have heard only good things about your shop).
1. Would a guy be better off setting himself up with 700 cases instead of maximizing the potential of his 650 cases? I do want to keep my 650 engine in my 650 but if the bottom end is a 650 still I would be happy as I would not have to change all my electronics etc. 2. If a guy were to use 700 cases will the exh/intake manifolds mate? I have a factory pipe sitting around and a mikuni 44sbn waiting on the sidelines for Christmas break from work/school. 3. If I stay with the 650 I am thinking of taking it 1 over in piston size. Using a 700's girdled head...question is what domes should a guy use on a setup like that for optimum output? 4. In the winter months what are you hours like? Turnaround time? Do I need to schedule? If I would like to see the work back by lets say December 21st when should I have it to you by? 5. I am considering PistonX piston kit. What has been your experince with them? Failures abound or a good way to go?
Last edited by broncojared; 09-21-2009 at 01:39 AM.
Your questions refer top "700" cases (Yamaha??) but you say you have a 650SX (Kaw) ... do you mean 750 cases??
Harry
Quote:
Originally Posted by broncojared
I know this may seem trivial but when you do your port/polish do you use flow bench tester?
Also, I am conjuring up what I am going to do on my build this winter. I have a 650sx and would like to get a more linear power out of her with the good portion on the bottom end. I would like your suggestions on a few things as I am considering sending my project your way for the machine work. (I have heard only good things about your shop).
1. Would a guy be better off setting himself up with 700 cases instead of maximizing the potential of his 650 cases? I do want to keep my 650 engine in my 650 but if the bottom end is a 650 still I would be happy as I would not have to change all my electronics etc. 2. If a guy were to use 700 cases will the exh/intake manifolds mate? I have a factory pipe sitting around and a mikuni 44sbn waiting on the sidelines for Christmas break from work/school. 3. If I stay with the 650 I am thinking of taking it 1 over in piston size. Using a 700's girdled head...question is what domes should a guy use on a setup like that for optimum output? 4. In the winter months what are you hours like? Turnaround time? Do I need to schedule? If I would like to see the work back by lets say December 21st when should I have it to you by? 5. I am considering PistonX piston kit. What has been your experince with them? Failures abound or a good way to go?
__________________ Unless otherwise stated, responses to all forum posts are based on my personal experiences working within the PWC industry, and developing high performance PWCs since 1987.
you can use 650 mag cup/stator assy on the 750 engine. I think GroupK has a tech article mentioning this and I know he still offers the case mod to allow bolting on the 650 front end on a 750 engine. Something to consider....
The kawi 750 sleeper set up runs very well, i have one now and couldn't be happier with performance for the reliability and fuel range i have.
BTW - if you have them do the work, make sure you mention if you ride at 3000'+ ??
We do not use a flow bench .... and this is a subject that's been blogged to death on many other forums.
Flow benches can be a very effective tool for 4 cycle cylinderhead modification, however not for a two stroke application. There are numerous high priorities for two stoke porting (such as actual port timing, port widths and roof contours, exhaust lead times (aka blowdown times), affects of exhaust system back pressures, raw fuel atomization, affects of inlet signal, and inlet tract resonation, ....just to name a few) that a flow bench has no way of evaluating and/or measuring. As a result, the flow bench (which is a great tool for four strokes) turns out to be not too effective in developing or evaluating two sroke porting.
Can one put a two stroke cylinder on a flow bench and turn it on ... sure. Unfoutunately, the information that you get is close to useless for improving the highest priority issues of 2 stroke porting.
Respectfully, Harry Klemm
Quote:
Originally Posted by broncojared
Harry,
Do you use a flow bench tester when port/polishing?
Thanks,
Jared
__________________ Unless otherwise stated, responses to all forum posts are based on my personal experiences working within the PWC industry, and developing high performance PWCs since 1987.
We do not use a flow bench .... and this is a subject that's been blogged to death on many other forums.
Flow benches can be a very effective tool for 4 cycle cylinderhead modification, however not for a two stroke application. There are numerous high priorities for two stoke porting (such as actual port timing, port widths and roof contours, exhaust lead times (aka blowdown times), affects of exhaust system back pressures, raw fuel atomization, affects of inlet signal, and inlet tract resonation, ....just to name a few) that a flow bench has no way of evaluating and/or measuring. As a result, the flow bench (which is a great tool for four strokes) turns out to be not too effective in developing or evaluating two sroke porting.
Can one put a two stroke cylinder on a flow bench and turn it on ... sure. Unfoutunately, the information that you get is close to useless for improving the highest priority issues of 2 stroke porting.
Respectfully, Harry Klemm
Well said...totaly agree.
__________________ 1995 PJS VHP7000, stock but darn fun.
1992 550 SX - R&R port Kawi Reed, Kind of fast.
1989 JS 550 - PJS motor Dual 46's, 50 MPH on GPS.
1986 JS 550 - Pile of parts at the moment.
1976 JS 400 - Pretty much just a shell.
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Re: Porting/Polishing Question. +Much More
lol
__________________
Quote:
Originally Posted by fastlife23, in regards to MrSki
Wow ive never seen a person ask the head of a profitable well known performance shop a question and then tell them what the answer should really be.?????? I am seriously dumbfounded.
Linear Mode
